Update copyright years.

From-SVN: r243994
diff --git a/libgcc/enable-execute-stack-mprotect.c b/libgcc/enable-execute-stack-mprotect.c
index 909a904..b038657 100644
--- a/libgcc/enable-execute-stack-mprotect.c
+++ b/libgcc/enable-execute-stack-mprotect.c
@@ -1,5 +1,5 @@
 /* Implement __enable_execute_stack using mprotect(2).
-   Copyright (C) 2011-2016 Free Software Foundation, Inc.
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
 
    This file is part of GCC.